Chancre

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A chancre ( SHANG-kər) is a painless genital ulcer most commonly formed during the primary stage of syphilis. This infectious lesion forms around 21 days after the initial exposure to Treponema pallidum, the gram-negative spirochaete bacterium causing syphilis, but can range from 10 to 90 days.

Excerpt from the Wikipedia article “Chancre”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Madhero88, CC BY-SA 3.0, via Wikimedia Commons.